Attachment for a rule, square, or the like



p 10, 1957 I L. E. DAOUST 2,805,484

ATTACHMENT FOR A RULE, SQUARE, OR THE LIKE Filed Oct. 7, 1954 me. a 2,, I INVENTOR. v

LUCIEN E. D'AOUST United States PatentO ATTACHMENT FOR A RULE, SQUARE, OR THE LIKE Lucien E. DAoust, Detroit, Mich.

Application October 7, 1954, Serial No. 460,927

Claims. (Cl. 33-173) will be noted that the attachment is used primarily as a guide for bearing against the edge of a drawing board, desk or the like.

When the invention is attached to a rule, the structure may be used as a straight edge to maintain the rule at right angles to an edge of the material to be marked. It may also be used in combination with a square to scribe lines without the use of an awl.

By forming the throatopen enough, the invention may be used as a folding rule so as to hold the ruler extension at any desired setting, the clamping screw of the device serving to retain the sections of the rule in fixed relation.

The structure, when clamped to a knife used for cutting linoleum and the like, may serve as a depth gauge, and it may also serve as a stop on a tool bit for making holes inwood for insertion of dowels and the like.

It is an object to provide an attachment of this class which will be simple in structure, economical of manufacture, durable, and highly eflicient in use.

Another object of the invention is the provision of an attachment of this kind which may be attached to a rule, square and the like, and set flush with the end of the rule.

Another object of the invention is the provision of an attachment of this type which may be set on a French curve or template and which can be moved along the work while so attached or remain attached while the curve or template is reversed.

Another object of the invention is the provision of an attachment of this type having points projecting outwardly therefrom and having their outer faces flush with the face of the main body.

Another object of the invention is the provision of an attachment of this class having a base and provided with a point projecting outwardly therefrom at substantially the medial line thereof.

Other objects will appear hereinafter.

It is recognized that various modifications and changes may be made in the detail of structure illustrated without departing from the invention, and it is intended that the present disclosure shall be considered to be but the preferred embodiment.

Forming a part of this which,

Fig. 1 is a perspective view of the invention;

Fig. 2 is a front elevational view of the invention;

Fig. 3 is a top plan view of the invention;

Fig. 4 is an illustration of the invention used as a supporting body for marking an arch;

Fig. 5 is an illustration of the use of the invention on a square;

Fig. 6 is a side elevational view of a rule or supporting body carrying the invention and showing it in use;

application are. drawings in Fig. 7 is an illustration of the invention attached on a French curve;

Fig. 8 is an illustration of the use of the invention in the drawing of straight lines.

As shown in the drawings, the invention is preferably made from a single piece of material and comprises the base 9 and a top leg 10 connected by the leg 11. Threaded through the top leg 10 is a screw 12. Struck from a forward side edge of the base 9 and projecting downwardly at substantially the medial line between the free edge of the base 9 and the leg 11 is the point 13. A similar point 14, which extends rearwardly, is struck from a side edge of the leg 11. An outer edge 17 of the base 9 lies in the same plane as the outer edge 16 of the leg 11 and the edge 15 of the top leg 10. An outer-face 19 of the tongue or point 14 lies in the same plane as the outer edge 18 of the top leg 10. One of the rear vertical corners of the leg 11 is cut away, as at 38, to provide an angularly disposed bearing surface.

In use, the invention would be attached to a ruler 20 or the like, the base 9 underlying the ruler and the leg 10 overlying it, and the screw 12 clamping the ruler 20 to hold the structure thereon. The point of a pencil 22 may engage in a notch 21 formed in one face of the ruler. When the point 13 is used as an axis, it is obvious that a circle may be described by the pencil point, and by adjusting the attachment to the desired position on the ruler; the radius of this circle may also be adjusted.

In Fig. 4 I have shown a square having the legs 23 and 24. A suitable supporting body 25, such as a rule or the like, is provided with a pair of the attachments mounted thereon. In this use of the attachment, the downwardly projected point 13 is used with its face 26 engaging the inner faces of the legs 23 and 24. The face 26 lies in the same plane as the face 27 of the top leg 10. On the outer endof the supporting body .25 another of the attachments is secured, and by holding the square steady and swinging the supporting body- 25 around, the outlines 37 of an arch may be formed.

In Fig. 5 I have shown the invention used with a board 28 or the like, on which certain lines may be marked. The utility of this application particularly relates to the laying out of steps, rafter cuts and brace cuts. In this illustration the square is provided with legs 25a and 24a, and the bearing surface 38 engages the edge 29 of the workpiece so that the edge of the square may be used as a guide for marking the desired lines.

In Fig. 7 I have shown the attachment mounted on a French curve 30 with the face of the point 13 engaging the edge 31 of the workpiece 32. It is believed obvious that the French curve may be moved lengthwise of the workpiece and, if desired, it may also be reversed to form scallops and the like.

In Fig. 8 I have shown the attachment mounted on the leg 25b of a square having the leg 24b. In this use the downwardly projecting point 13 would engage the edge 33 of the material 34 to be marked, and by using the line 35 as a starting line, it is believed obvious that additional lines 36, etc., may be easily and quickly drawn in equally spaced relation. The aforesaid action is accomplished by setting the two attachments shown in Fig. 8 a predetermined distance apart so that the faces 19, on the points 14, will be spaced apart a distance equal to the desired distance between the lines to be drawn, as 35 and 36. Then, by adjusting the position of the square so as to bring the face 19 of the left attachment in alignment with line 35, a mark may be made along the face 19 on the right attachment to indicate where the line 36 is to be drawn. The line 36 is then drawn in the usual manner by means of the leg 24b of the square. Additional lines 36 may be marked from the next preceding line 36 in this manner.

2,805,484 r Y a By having the face 26 of the point 13 flush with'the face 27, the structure may be mounted on the extreme end of a rule, which renders the attachment highly efficient, inasmuch as previous attachments did not have thisifeature. Y i e e What I claim is: I

l. A rule attachment of the class described, comprising: a base; a leg projected vertically upwardlylfrom said base; an upper leg, angularly connected to the first leg, overlying said base, in parallel :relation thereto, spaced therefrom; a sharpened tongue struck from said base and bent downwardly, the outer face of said tongue lying in the same plane as the corresponding face of said upper leg; and a sharpened tongue struck'fromtsaid'vertically extending leg and :projecting rearwardly therefrom to lie in the plane of said base, and having its outer face lying in the plane of the corresponding face of said upper leg.

'2. An attachment of the class describedgcomprisizug:

an'article'made from a single piece of material and comprising a base; an upwardly directed leg on the rear end of said base; an upper leg extending forwardly from the first leg andoverlying said base in spaced relation thereto, the side faces of said base and said upper leg lying in the same plane; a pointed tongue struck from a forward side edge of said base and bent downwardly at right angles thereto, the outer edge of said forward tongue lying in the 'same plane as the edge of said base; and a tongue struck from a side edge of said forwardly extending leg and bent rearwardly thereto and lying in the same plane as said base, the outer face being flush with the corresponding face of said base. 7

3. An attachment of the class described, comprising: an article made from a single piece of material and comprising a base; an upwardly directed leg on the rear end of said base; an upper leg extending forwardly from the first leg and overlying said base in spaced relation thereto, the side faces of said base and said upper leg lying in the same plane; a pointed tongue struck from a forward side edge of said base and bent downwardly at right angles thereto, the outer edge of said forward tongue lying in 4 the same plane as the edge of said base; a tongue struck from a side edge of said forwardly extending leg and bent rearwardly thereto and lying in the same plane as said base, the outer face being flush with the corresponding face of said base; and a screw threaded through said upper leg for clamping an object against the said base.

4. A rule attachment of the class described, comprising: a base; a leg projected vertically upwardly from said base; an upper leg, angularly connected to the first leg, overlying said base, in parallel relation thereto, spaced therefrom; a sharpened tongue struck from said base and bent downwardly, the outer face of said tongue lying in the same plane as the corresponding face of said upper leg; a sharpened tongue struck from said vertically extending leg and projecting rearwardly therefrom to lie in the plane of said base, and having its outer face lying in the plane of the corresponding face of said upper leg; and a screw threaded through said upper leg for clamping of an object against the upper face of said base.

5. A rule attachment of the class described, comp'rising: a base; a leg projected vertically upwardly fromsaid base; an upper leg, angularly connected to the first leg, overlying said base, in parallel relation thereto, spaced therefrom; one of the rear vertical corners of said leg being cut away to provide an angularly disposed bearing surface; a sharpened tongue struck from a forward side edge of said base and bent downwardly, the outer face of said tongue lying in the same plane as the corresponding face of said upper leg; and a screw threaded through said upper leg for detachably clamping an object against said base. 7

References Cited in the file of this patent UNITED STATES PATENTS 1,390,821 Seals Sept. 13, 1921 2,651,843 'Goodford Sept. 15, 1953 FOREIGN PATENTS 859,528 Germany Dec. 15, 1952 

